stop playing actual sounds on travis

.travis.yml

@@ -1,3 +1,4 @@
 language: node_js
 notifications:
   email: false
+script: CI=true npm test

tests.js

@@ -87,10 +87,11 @@ describe("overridable options", function(){
 
 })
 
-it("provides a function for easy testing", function(done){
-  var player = require('./')()
-  player.test(function(){
-    done()
+if (!process.env.CI){
+  it("provides a function for easy testing", function(done){
+      var player = require('./')()
+      player.test(function(){
+        done()
+      })
   })
-})
-
+}